1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcff5ab0c34ebe0eb37b08d5e99871114533b20e5bcc3861d32274eb6b8a9bae6. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3f88d806-52fc-420d-b2c0-f64b474d13ef.json and https://artists.proofprofile.net/proofs/artist/3f88d806-52fc-420d-b2c0-f64b474d13ef.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9205fde86dd40fa34548ef7c0fbe631f5d9082bab9fbfd064134a7e044992e8. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEH742221753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29b543bd0d43951b89d3f68eb6dca8bcf40a15f74cb3a01bc5337d60253ba20c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEH742223947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x936a0e11e1862f5f2ead304020381e8ebb6a7af1473571ce5fb105f9ff253b21. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEH742223948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ee14d5bb72593ec368f5b965009436a904f064c21b77638de47c2903bdd5c5c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEH742230244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9560773e99bbd6915729210fece74db9f30ebbb348f88f37c3f0f5e88b72d71e. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEH742307714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3074b2e21f8355a0db0bc72619c3c49979cffab8d9b5485eb0e4ad886b6eedd5. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEH742307715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c93c5e4dd19f3c5497d7499543ef96602bc364724c5014c3d3731b2814b3d63. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEBY72300504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd79299ab95be42c0834779b7ddec891041f1508352ef6e404ff2fc302872a415. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEH742325007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb420f70f3697bb8fe5e973dd582c34002922ecedc4dcee2865aba4836787982. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEY472473666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1647e5b37e09cdf3b7c82c48a341d07d67020de6fb4648cae9ffc67c387e7867. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEH742428942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf03156313aef9daaffaa30d50fe42f1148668a9d7000c8e3e040768de34570b8. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEH742437055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe096d454cc9aa45e72079fbca66756a3d32eb503c9ab824245b3950cb5267157. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEH742506229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d69c46a0194249ceec7c4b05705e17a024f92e54110958a54a71ef83dd4379e. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEH742506230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ba00eafd8b173e260c1dd3447730a36f2fd519101f3034fd584e07b10a6e9d. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEH742506231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa87c568afc3b5eb4a5d5e72c5248cbb69a428b6705761534f6135ced0b297316. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEH742506236.